Yakima County WA Community Homepage

Lower Yakima Valley Groundwater Management Area Safe Drinking Water Initiative


Yakima County, in partnership with the Washington State Department of Health and the Yakima Health District, is offering free nitrate testing for private and shared drinking water wells in the Lower Yakima Valley Groundwater Management Area (LYV GWMA).  Eligible households may also receive free bottled water and/or a free nitrate treatment system. 

How do I know if I am eligible for free nitrate testing?


If you live within the green boundary line of the map, below, and obtain your drinking water from a private or shared well, you are eligible.  In, addition homeowners and renters living in one of the seven phases on the map will receive a packet in the mail with information about the project and a nitrate test strip to test their drinking water. 

Still not sure if you're eligible? 

Please fill out this survey form or call 1-866-886-7117 to see if you are eligible. Once you have completed the survey, you will be notified via email or phone call regarding your qualification status.

Nitrate test card results and what they mean.

If you received a packet and returned your Nitrate test card results to us, you will receive one of the following Nitrate response letters based on your results.  Each letter contains important information to help you and your family maintain a safe drinking water supply. 

1. Nitrate results between 0-4
2. Nitrate results between 5-9
3. Nitrate results 10 and above

To confirm if your household is within the LYV GWMA, enter your address  HERE or review the following map.

GWMA Phased Map 2024-02-14 123316

Click  HERE to see the GWMA interactive map. 

GWMA Nitrate Test Results: Metric Report as of 02/23/2024.

This report summarizes the number of returned test strips from eligible households and is updated weekly on this website. 

2.23.2024 GWMA ENG Report

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